I tested PCF1306P, ROM y Z-80 chips but there also were ok.Finally, I found that the scope showed some ac signal in the +12v. With red border, there was a lot of noise. There were also some pixels across the screen. Spectrum 48K issue 6.At start, the screen showed vertical black and white lines. Thanks to José ManuelĢ9/09/13 New interface: 32K RAM internal upgrade made by Indescomp. Scheme Eagle and ROM files.ġ9/10/13 New interface: Sound Amplifier made by indescomp. I put Spectrum +2B issue 1 photo in computers seccion. At start, the screen was black with white border. Betadisk clon made by a Polish company p.z.apina. The first scheme didn't have this option.ĪC DOS disk interface. Ī little jumper near of volumen area allow to configure the PCB for 2732 EPROM instead original 2716. Light pen Investronica/Inaxel with photos of original box (in bad conditions).ġ9/10/14 Corrects a small error in RBG pins ofģ1/08/14 Update the scheme of Sound&Joystick Interface. PCF1306P faulty.Ģ9/11/14 New photo of an older Inves spectrum + board. The screen change a bit but it was very similar. The screen didn't change after press reset. The cables came loose and caused a short circuit. Interface Joystick tipo "Kempston" indescompĠ6/01/15 New Spectrum Fault: Spectrum +128K issue 2.1. The design of this interface was the same as: Interface joystick tipo "kempston" made by K DANNER. Thanks to José Manuel.Įxternal extension 32K made by Indescomp (MHT ingenieros). Thanks to José Manuel.ĭEFCON made by Ocio ZX. I couldn't make the scheme because the PCB is covered with resin. This interface is the same asĬentronics-RS232 Indescomp that was distributed by indescomp and manufactered by MHT. Finally I changedĬentronics-RS232 made by MHT ingenieros. I desolder and test the rest of RAM chips. Changed 78L12 regulator.ģ) It still doesn't start. I desolder these 2 RAM chips and TS2068 gives +5v.Ģ) No TV image. There are 2 RAM chips 4416 that warm a lot. I open it and detect that +5v power supply only gives +3v. Unsolder several chips untilģ1/05/15 New Spectrum Fault: Timex Sinclair 2068 with several faults.ġ) No power. Memory tests gave messages of upper RAM banks fault but It can not identify the damaged chip. Sometimes it worked but most times it didn't. Spectrum worked well.Changed original EPROM with a new one. Spectrum+128K issue 2.0.It always showed the same image. Joy III made by JG Componentes (Portugal). Changed Z-80 and the problem is solved.Ģ0/02/16 Photo of a ZX Spectrum 48K issue 5.Ĭomputers seccion.Thanks to Carlos Lafonte. With the scope, I detected that there were no activity in most Z-80 pins. At power up, the timex showed black screen. It has ZX Spectrum ULA.Ĭomputers seccion.Thanks to Mario Hernández.Ġ6/04/16 New Fault: Silver Timex Computer 2068. Thanks to Dandare, Floppy and ElfoOscuro.Ġ6/07/16 PCB Photo of TK90X issue A that was sold in Uruguay. Multiface 3 clone made by Hard Micro has been updated with R1, R2 and C1 values. ULA is broken so I'm not be able to repair it.Ĭopiasoft made by JGComponetes because the old one was incorrect. I update the website with all corrected data and files.ġ8/02/18 New fault: ZX with white screen. Set Grabacion made by indescomp for ZX81.Ĭorrecting this error, the board designed by Merlinv works perfectly.
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